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x-45=80+2x
We move all terms to the left:
x-45-(80+2x)=0
We add all the numbers together, and all the variables
x-(2x+80)-45=0
We get rid of parentheses
x-2x-80-45=0
We add all the numbers together, and all the variables
-1x-125=0
We move all terms containing x to the left, all other terms to the right
-x=125
x=125/-1
x=-125
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